Chaplet or stud for use in foundry work



Dec. 8, 1936.

F. SEIBEL CHAPLET 0R STUD FOR USE IN FOUNDRY WORK Filed Nov. 7, 1934 Patented Dec. 8, 1936 UNITED STATES PATENT OFFICE CHAPLET OR STUD FOR USE IN FOUNDRY WORK Application November 7, 1934, Serial No. 751,851 In Germany September 15, 1933 6 Claims.

The invention relates to chaplets or studs for use in foundry work, the surface of the stem of the chaplet or stud being formed with projections which are of considerable assistance in the operation of welding or fusing to the molten metal.

Most of the chaplets now in use have stems that are circular in cross-section, their surface being smooth or heavily scored. Angular stems are known which are partly provided with teeth for the purpose of increasing the superficial area. Furthermore, chaplets are known having stems which are grooved longitudinally or transversely and are in part helically formed. All these constructions in their relation with respect to the molten metal have part of their surface flata disadvantage in that the welding or fusing to the molten metal is thus frequently incomplete so that the castings are often faulty. Occasionally too, the rising molten metal does not completely surround the chaplet, and as a result, when the metal flows over the edges of the grooves in the stem of the chaplet, air bubbles are formed so that the casting produced is faulty.

According to the invention, a chaplet is provided having projections on the surface of the stem or stems, which projections are distributed over the whole or greater part of the surface of the chaplet and are formed to taper towards the outer ends. The stems of the chaplets are advantageously provided with pyramidal projections over a wide area and thus there are produced a large number of projections, which immediately the molten metal enters the hollows begin to fuse therewith. The desired fusion then continues over the whole surface.

The large number of sharp projections considerably increases the superficial area of the stem without unduly increasing its thickness, as is the case with some chaplets at present in use.

It is further proposed so to subdivide the projections that several zones are produced whose fusing characteristics differ amongst themselves. The reason for this is that even where fusion is incomplete (as may occur, for example, when the metal is poured into the mould while relatively cold) there is always sufiicient anchorage at the positions where the projections are situated, and thus the cast chaplet is in every case securely held in the casting even when the preparations have not been carried out with care.

The accompanying drawing illustrates one example of a chaplet provided according to the invention.

Figures 1 and 2 are respectively elevation and plan of a chaplet produced according to the invention, which consists of two sheets of metal and two rods.

Figure 3 shows the stem of the chaplet in longitudinal section.

Figure 4 shows the stem in transverse section, and

Figure 5 illustrates the partial development of the stem.

The chaplets illustrated in the drawing consist of two parallel metal sheets a and b and one or more stems in the form of circular rods 0, which are riveted to the metal sheets. The stems c are provided with longitudinal and transverse angular grooves, forming a large number of small pyramids. The cylindrical material is drawn with longitudinal grooves in the drawing operation. The transverse grooves are produced on automatic lathes by grooving at the same time as the rivet pins g are formed. At certain positions the transverse groove is omitted so that thus ridges f are obtained. In this way the pyramidal field is interrupted where desired in order to produce particular melt zones, which serve for more effective anchorage.

Instead of the stems being cylindrical they may be flat or have any other cross-sectional shape. If fiat stems, are used the pyramidal projections may be formed at the same time in the same rolling operation as the stems.

I claim:

1. A chaplet comprising at least one stem element the surface of which has distributed over it a plurality of projections formed to taper on all sides towards the outer ends, the said projections sub-dividing the surface in the axial and peripheral directions.

2. A chaplet comprising at least one stem element the surface of which has distributed over it a plurality of pyramidal projections, the said projections sub-dividing the surface upon which they are disposed in the axial and peripheral directions.

3. A chaplet comprising at least one stem element, the whole of the surface of which has distributed over it a plurality of projections formed to taper towards the outer end, the said projections sub-dividing the surface in the axial and peripheral directions.

4. A chaplet comprising at least one stem element, the surface of which has distributed over it in spaced bands a plurality of projections formed to taper on all sides towards the outer ends, the said projections sub-dividing the surface in the axial and peripheral directions.

5. A chaplet comprising at least one stem element, the surface of which is covered wholly by longitudinal and transverse grooves forming projections which taper outwardly.

6. A chaplet comprising at least one stem ele- 5 ment, the surface of which is covered by projections formed by longitudinal and transverse grooves, the said projections being formed to taper towards the outer ends, the surface being divided into fields of projections by boundaries formed by the omission of at least one of the transverse grooves.

FRITZ SEIBEL. 

